A flask has two sides separated by a selectively permeable (semi-permeable) membrane. I place a 10% sucrose/water solution in side A and a 20% sucrose/water solution in side B. Please predict in which direction most of the water will move via osmosis.
from Side A to side B
from Side B to side A
there will be no movement of water
water will move from B to A and A to B at equilibrium
The Correct Answer is A
A. from Side A to Side B: Osmosis is the movement of water from a region of lower solute concentration (10%) to one of higher solute concentration (20%) to equalize the concentration.
B. from Side B to Side A: This would occur only if Side A had a higher solute concentration, which it doesn't.
C. there will be no movement of water: There’s a concentration gradient, so water will move.
D. water will move from B to A and A to B at equilibrium: Equilibrium implies equal concentrations, which is not the case initially.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. compounds that are ionically bonded together: Ionic compounds (like NaCl) dissociate easily in water because water's polarity can separate the positive and negative ions.
B. carbon-hydrogen chains, like saturated fats: These are nonpolar covalent compounds and are hydrophobic, so they don’t dissolve or dissociate well in water.
C. compounds that are covalently bonded together: Covalent bonds are strong and molecules remain intact in water; they don’t dissociate into ions.
D. compounds with covalent and some polar covalent bonds: These might partially dissolve but don’t dissociate readily into ions like ionic compounds do.
Correct Answer is D
Explanation
A. monosaccharides: Monosaccharides are the building blocks of carbohydrates, not lipids.
B. a glycerol plus three glycogen chains: Glycogen is a polysaccharide, not a component of triglycerides.
C. a glycerol plus three amino acid chains: Amino acids form proteins, not triglycerides.
D. a glycerol plus three fatty acid chains: A triglyceride is made of one glycerol molecule and three fatty acids-this is the primary structure of fats.
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